TY - JOUR
T1 - Secrecy Performance Analysis of Mixed α - μ and Exponentiated Weibull RF-FSO Cooperative Relaying System
AU - Juel, Nazmul Hassan
AU - Badrudduza, A. S.M.
AU - Islam, S. M.Riazul
AU - Islam, Sheikh Habibul
AU - Kundu, Milton Kumar
AU - Ansari, Imran Shafique
AU - Mowla, Md Munjure
AU - Kwak, Kyung Sup
N1 - Funding Information:
This work was supported in part by the National Research Foundation of Korea—Grant funded by the Korean Government under Grant Ministry of Science and ICT-NRF-2020R1A2B5B02002478, and in part by Sejong University through its Faculty Research Program under Grant 20212023.
Publisher Copyright:
© 2013 IEEE.
PY - 2021/5/21
Y1 - 2021/5/21
N2 - Increasing concerns regarding wireless systems' security are leading researchers to exploit the physical properties of a medium while designing any secured wireless network. The secrecy performance of a mixed radio frequency-free space optical (RF-FSO) system with a variable gain relaying scheme is investigated in this paper under the attempt of wiretapping by an eavesdropper. We assume that the eavesdropper can intrude the target data from the RF link only. Both the RF links (main and eavesdropper) undergo the $\alpha -\mu $ fading statistics and the FSO link experiences the exponentiated Weibull fading statistics. Exploiting the amplify-and-forward (AF) relaying scheme while considering two detection techniques (i.e. heterodyne detection and intensity modulation/direct detection) with pointing error impairments, the mathematical formulations of the unified probability density function and cumulative distribution function are performed for the equivalent signal-to-noise ratio of the considered dual-hop RF-FSO link. Closed-form analytical expressions for average secrecy capacity, secrecy outage probability, and the probability of non-zero secrecy capacity are derived in terms of Meijer's $G$ and Fox's $H$ functions to quantify the system performance. Capitalizing on these expressions, the secrecy performance is further analyzed for various channel parameters of RF links, aperture sizes of the receiver, pointing errors, and atmospheric turbulence severity. The results reveal that aperture averaging can improve the secrecy performance remarkably by suppressing the effects of turbulence. Monte Carlo simulations are provided to justify the accuracy of the proposed model.
AB - Increasing concerns regarding wireless systems' security are leading researchers to exploit the physical properties of a medium while designing any secured wireless network. The secrecy performance of a mixed radio frequency-free space optical (RF-FSO) system with a variable gain relaying scheme is investigated in this paper under the attempt of wiretapping by an eavesdropper. We assume that the eavesdropper can intrude the target data from the RF link only. Both the RF links (main and eavesdropper) undergo the $\alpha -\mu $ fading statistics and the FSO link experiences the exponentiated Weibull fading statistics. Exploiting the amplify-and-forward (AF) relaying scheme while considering two detection techniques (i.e. heterodyne detection and intensity modulation/direct detection) with pointing error impairments, the mathematical formulations of the unified probability density function and cumulative distribution function are performed for the equivalent signal-to-noise ratio of the considered dual-hop RF-FSO link. Closed-form analytical expressions for average secrecy capacity, secrecy outage probability, and the probability of non-zero secrecy capacity are derived in terms of Meijer's $G$ and Fox's $H$ functions to quantify the system performance. Capitalizing on these expressions, the secrecy performance is further analyzed for various channel parameters of RF links, aperture sizes of the receiver, pointing errors, and atmospheric turbulence severity. The results reveal that aperture averaging can improve the secrecy performance remarkably by suppressing the effects of turbulence. Monte Carlo simulations are provided to justify the accuracy of the proposed model.
KW - α-μ fading
KW - exponentiated Weibull fading
KW - variable gain relay
KW - physical layer security
KW - average secrecy capacity
KW - secrecy outage probability
KW - probability of non-zero secrecy capacity
UR - http://www.scopus.com/inward/record.url?scp=85105883474&partnerID=8YFLogxK
U2 - 10.1109/ACCESS.2021.3078610
DO - 10.1109/ACCESS.2021.3078610
M3 - Article
AN - SCOPUS:85105883474
VL - 9
SP - 72342
EP - 72356
JO - IEEE Access
JF - IEEE Access
SN - 2169-3536
M1 - 9427251
ER -
